What are Flatworms?

Flatworms are invertebrates of the Platyhelminthes genus, and are collectively referred to as three types of planarians, tapeworms and flukes. Without a complete digestive system, the ventral opening is both the mouth and its anus. Mostly hermaphrodites, often with auto-fertilization, but also with hetero-fertilization.

Flatworm

The evolutionary significance of flatworms: Since the flatworms began to appear a "organ" level of life.

Flatworms are androgynous,

Planeworms are often used to study regeneration, and the species capable of asexual reproduction have the strongest regeneration ability. Cut from any part of the body of Stenostomum

Plane worms are mostly carnivorous. Due to various developed feeding mechanisms, they can prey on animals larger than themselves, such as link animals, arthropods, and shellfish.

Both free-living and parasitic species make use of oxygen, but most parasitic species dominate anaerobic metabolism, even in aerobic environments, such as in the bloodstream. Instead of

Flatworm

Compared with other invertebrates, parasitic flat animal tissues are high in carbohydrates and low in protein. Ascaris carbohydrates are mainly glycogen, which is the main source of energy in hypoxic environments. Some types of glycogen make up more than 40% of the body's dry weight.